firstly wrong section, secondly why?
they're a bigger engine than a zetec, and they fit snuggly, not sure the extra cylinders width will fit.
also, why? you can easily have too much power from a FRS/zetec turbo engine in a mk2 xr2, i can't get grip in anything but the dry in my zetec turbo in my xr2 and even then struggle as i turn the boost up past a BAR.